CN111958045A

CN111958045A - Fixing device for fixing a chain saw blade and chain saw

Info

Publication number: CN111958045A
Application number: CN202010392774.9A
Authority: CN
Inventors: M·林; R·格勒内瓦尔德; T·孔奇克
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2019-05-10
Filing date: 2020-05-11
Publication date: 2020-11-20
Anticipated expiration: 2040-05-11
Also published as: EP3736093B1; CN111958045B; EP3736093A1; DE102019206767A1

Abstract

The invention relates to a fastening device for fastening a chainsaw blade to a drive unit and/or a housing of a chainsaw, comprising at least one cover unit (20 a; 20 b; 20c), at least one fastening unit (18 a; 18 b; 18c) for fastening the chainsaw blade (22 a; 22 b; 22c) and the cover unit (20 a; 20 b; 20c) to the drive unit (14 a; 14 b; 14c) and/or the housing (16 a; 16 b; 16c), and at least one securing unit (24 a; 24 b; 24c) which is provided to secure the fastening unit (18 a; 18 b; 18c) against being released at least partially from the cover unit (20 a; 20 b; 20 c). According to the invention, the securing unit (24 a; 24 b; 24c) is designed as a force-locking unit, in particular as a magnetic unit, which is in particular at least substantially free of form-locking. The invention also relates to a chain saw with the fixing device.

Description

Fixing device for fixing a chain saw blade and chain saw

Technical Field

The present invention relates to a fixing device for fixing a chainsaw blade and a chainsaw having the same.

Background

From EP 2777901 a1, a fastening device for fastening a chainsaw blade to a drive unit and/or a housing of a chainsaw is known, which fastening device has at least one cover unit, at least one fastening unit for fastening the chainsaw blade and the cover unit to the drive unit and/or the housing, and at least one securing unit which is provided to secure the fastening unit against detachment at least partially at the cover unit.

Disclosure of Invention

The invention relates to a fastening device for fastening a chainsaw blade to a drive unit and/or a housing of a chainsaw, comprising at least one cover unit, at least one fastening unit for fastening the chainsaw blade and the cover unit to the drive unit and/or the housing, and at least one securing unit which is provided to secure the fastening unit against detachment at least partially from the cover unit.

It is proposed that the securing unit is designed as an at least substantially form-locking force-locking unit, in particular as a magnetic unit.

Preferably, the fixing device is provided for fixing the chainsaw blade, in particular in a removable manner, to the drive unit and/or the housing of the chainsaw by means of the fixing unit. The cover unit is preferably provided for at least partially covering the fastening unit and/or the chainsaw blade, in particular in the region of the fastening unit and/or the chainsaw blade resting against the drive unit and/or the housing of the chainsaw. "provided" is to be understood in particular as specially set up, specially designed and/or specially equipped. An "object is provided for a specific function" is to be understood in particular to mean that the object fulfills and/or performs the specific function in at least one application state and/or operating state. In particular, the drive unit is designed, for example, as an electric motor or as an internal combustion engine. Preferably, the drive unit is arranged for driving a cutting chain of the chainsaw guided over the chainsaw blade. Preferably, the fastening device, in particular the fastening unit, is provided for at least partially releasing the chainsaw blade, the cutting chain, the drive unit and/or the housing for replacement and/or cleaning.

In particular, the fastening unit preferably has at least one fastening state in which, in particular, the cover unit and the chainsaw blade are fastened to the drive unit and/or the housing via the fastening unit. In the secured state of the securing unit, the securing unit is preferably arranged at least partially on the cover unit and/or the securing unit. The cover unit preferably has at least one, in particular exactly one, cover element, which is in particular at least partially configured to correspond to a housing of the chainsaw. Preferably, the cover element is provided for covering at least one chain drive region, in particular at least one drive pinion, of a drive unit and/or a housing of the chainsaw and an end region of the chainsaw blade. In the secured state of the securing unit, the at least one cover element preferably rests at least partially, in particular at least predominantly, against a housing of the chainsaw. Preferably, the at least one cover element and the housing at least partially, in particular at least predominantly, enclose the fixing unit, the safety unit and/or the chainsaw blade in the fixed state of the fixing unit. The securing unit is preferably provided for securing the at least one fastening element of the fastening unit against removal from the cover unit. Preferably, the fastening element is configured to be removable and/or detachable from the drive unit, the housing and/or a corresponding fastening element, which is in particular connected to the drive unit and/or the housing, in particular for removing the cover unit, in particular the cover element and/or the chainsaw blade. The corresponding fastening element is preferably designed as a screw, a stud or the like. However, it is also conceivable for the counter-securing element to have other configurations which are of interest to the person skilled in the art. The corresponding fixing element preferably extends from the housing.

The fastening unit preferably has at least one fastening axis along which the fastening element can be removed from the counter-fastening element for releasing the fastening unit and/or along which the fastening element can be connected to the counter-fastening element for fastening the fastening unit, in particular the cover unit and/or the chainsaw blade, to the drive unit and/or the housing. In particular, the fixing element can be screwed onto the counter-fixing element about a fixing axis. Preferably, the fixation axis is at least substantially parallel to the central axis of the fixation element and/or aligned with the longitudinal axis of the corresponding fixation element. The fastening axis is preferably oriented at least substantially perpendicularly to the main extension axis of the chainsaw blade and/or the cover unit, in particular the cover element. The term "main axis of extension" of an object, in particular of a chainsaw blade, a cover unit and/or a cover element, is to be understood in particular as meaning an axis which runs parallel to the longest edge of the smallest geometrical cuboid which can just as well completely enclose the object. For example, the fastening element is designed as a nut and the counter-fastening element is designed as a screw or a stud which can be fixedly connected, in particular, to the drive unit and/or the housing. However, other configurations of the fastening unit are also conceivable, wherein in particular the fastening element can be guided along and/or around a fastening axis for fastening. Particularly preferably, in the fixed state of the fixing unit, the fixing element is arranged spaced apart from the chainsaw blade along the fixing axis.

The term "securing unit is configured as a force-locking unit" is to be understood in particular to mean that the securing of the fastening unit, in particular of the fastening element, on the cover unit, in particular on the cover element, by the securing element is effected at least for the most part, in particular completely, by a magnetic and/or mechanical force-locking. The securing unit, which is designed as a force-locking unit, is preferably provided for securing the fastening unit, in particular the fastening element, at least partially against detachment from the cover unit by force-locking with the fastening unit, in particular the fastening element. Preferably, the securing unit is provided for securing the fastening element against a release on the cover element at least in the axial direction along the fastening axis. Preferably, the fixing element, in the state secured by means of the securing unit, can be rotated relative to the securing unit about a fixed axis, in particular over 360 °. Preferably, the force-locking connection between the securing unit, which is designed as a force-locking unit, and the fastening unit, in particular the fastening element, is formed, for example, by friction and/or magnetic forces. The "at least substantially non-form-locking" design of the securing unit, which is designed as a force-locking unit, is to be understood in particular to mean that the connection between the securing unit and the fastening unit and the securing element, in particular the securing element of the securing unit, are independent of the macroscopic geometric engagement of the fastening unit, in particular of the fastening element.

The securing unit, which is designed as a force-locking unit, is preferably provided for loading the fixing element with at least one securing force, in particular a frictional force and/or a magnetic force, in at least one direction, in particular oriented at least substantially parallel to the fixing axis, at least substantially from the fixing element toward the securing unit. Preferably, the securing force is at least equal to the weight of the securing element and/or the at least one cover element. Preferably, the fastening element can be released from the cover unit, in particular the cover element, by applying a release force counter to the securing force, wherein the release force is in particular at least greater than the securing force.

It is conceivable for the securing unit to be provided for loading the fastening element with a securing force during a, in particular continuous, relative movement of the fastening element and the cover element along the fastening axis, which securing force is at least partially opposed to the relative movement. It is additionally conceivable for the fixing unit to comprise at least more than one fixing element and/or at least more than one corresponding fixing element. These fixing elements are preferably releasable independently of one another from the cover element, the drive unit, the housing and/or the corresponding fixing element. Preferably, the fastening units are provided for securing the fastening elements against detachment from the cover unit, in particular from the cover element, independently of one another.

By configuring the fastening device according to the invention, it is advantageously possible to ensure a simple and reliable securing of the fastening unit against detachment from the cover unit, in particular because the securing of the fastening element against detachment from the fastening unit can be ensured without form-locking and thus operating errors or malfunctions due to damage can be avoided. Rapid and simple manufacture and assembly of the securing element and the securing unit can advantageously be achieved. A quick and simple replacement of the fixing element can advantageously be carried out, in particular without the cover unit having to be partially removed. In particular, low costs can be advantageously achieved by rapid and simple production and assembly. Wear of the components of the securing unit and/or the securing unit can advantageously be at least substantially avoided, in particular because the securing can be carried out without form closure.

Furthermore, it is proposed that the securing unit has at least one force-locking element for a force-locking, in particular magnetic, connection, in particular at least substantially without form-locking, with at least one fixing element of the fixing unit, in particular with the aforementioned fixing element, wherein the force-locking element engages in the cover unit, in particular in a cover element of the cover unit that can be placed against the chainsaw blade, in particular in the aforementioned cover element, in particular is fixed in a slot of the cover element by means of a force-locking and/or form-locking connection, or is formed integrally with the cover element by means of a material-locking connection. The cover element is preferably at least partially made of rubber, plastic and/or metal. The force-locking element is preferably fastened to the cover unit, for example by interference fit, by means of a thread, integrally by means of an injection molding method, by means of a welded connection, by means of an adhesive connection or the like. The force-fitting element is preferably arranged, in particular in the secured state of the securing unit, on at least one side of the cover element facing away from the securing element. Preferably, the cover element is arranged at least partially between the fixing element and the force-fitting element, in particular in the fixed state of the fixing unit. However, it is also conceivable for the force-locking element to be fixed in a slot of the cover element by means of a force-locking and/or form-locking connection or to be formed integrally with the cover element by means of a material-locking connection and to be arranged on the side of the cover element facing the fixing element. The notches are preferably configured to correspond to the basic shape of the force-locking element. Alternatively or additionally, it is conceivable for the cover element to have at least one holding element, which is provided for fixing the force-fitting element to the cover element. For example, the holding element is designed as a magnet, as a magnetizable element, as a latching element, or the like. Preferably, the force-closure element is detachably connected to the cover element, in particular by a retaining element. By configuring the fastening device according to the invention, the securing unit, in particular the force-fitting element, can be advantageously connected to the cover unit, in particular the cover element, in a simple and secure manner.

Furthermore, it is proposed that the fixing unit has at least one force-fitting element, in particular the aforementioned force-fitting element, for a force-fitting connection, in particular a magnetic connection, with at least one fixing element, in particular the aforementioned fixing element, of the fixing unit, in particular at least substantially without form-fit, wherein the force-fitting element surrounds the fixing element at least in sections in the state in which the fixing element is arranged on the cover unit, in particular on the cover element of the cover unit. Preferably, in particular in the secured state of the securing unit and/or in the secured state of the securing element, the force-fitting element is arranged around the securing element, in particular in the circumferential direction of the securing element, along at least one angular range, in particular greater than 5 °, preferably greater than 15 °, particularly preferably greater than 45 °. Preferably, the circumferential direction of the fastening element and/or the counter-fastening element extends in a plane which extends at least substantially perpendicularly to the longitudinal axis of the counter-fastening element and/or perpendicularly to the fastening axis. It is conceivable for the securing unit to comprise force-locking elements which enclose the fixing element in sections, wherein the force-locking elements are arranged uniformly or non-uniformly around the fixing element. By configuring the fastening device according to the invention, a uniform force-locking connection between the fastening unit, in particular the fastening element, and the securing unit, in particular the force-locking element, is advantageously possible. A connection between the fastening element and the force-fitting element, which is advantageously free of play, can be achieved.

It is further proposed that the fastening unit has at least one force-fitting element, in particular the aforementioned force-fitting element, for a force-fitting connection, in particular a magnetic connection, in particular at least substantially without form-fit, with at least one fastening element of the fastening unit, wherein the force-fitting element is in particular designed in a circular ring shape in at least one plane extending at least substantially perpendicularly to the fastening axis and/or longitudinal axis of the respective fastening element. Preferably, at least in the secured state of the securing unit, the force-fitting element at least substantially completely surrounds the securing element and/or the counter-securing element, as seen in at least one plane extending at least substantially perpendicularly to the securing axis and/or the longitudinal axis of the counter-securing element. Preferably, the fastening element has an outer circumference in a plane extending at least substantially perpendicularly to the fastening axis and/or the longitudinal axis of the corresponding fastening element, which outer circumference is in particular designed to correspond to the inner circumference of the annular force closure element. Preferably, the fixing element at least in the fixed state of the fixing unit, in particular in the secured state of the fixing element, at least partially, in particular at least predominantly, abuts with an outer surface, in particular facing away from the fixing axis, against an inner surface, in particular facing the fixing element, of the force-closure element. Preferably, the force-fitting element has at least in sections an at least substantially hollow annular basic shape. By configuring the fastening device according to the invention, an advantageously uniform force-locking connection between the fastening unit, in particular the fastening element, and the securing unit, in particular the force-locking element, is made possible. A connection between the fastening element and the force-fitting element, which is advantageously free of play, can be achieved.

Furthermore, it is proposed that the securing unit has at least one force-locking element, in particular the aforementioned force-locking element, for a force-locking, in particular magnetic, connection, in particular at least substantially non-form-locking, with at least one fixing element of the fixing unit, in particular the aforementioned fixing element, wherein the fixing element comprises a force-locking region and a fixing region, wherein the length of the force-locking region along a fixing axis of the fixing unit, in particular the aforementioned fixing axis, is greater than the length of the fixing region. The fastening region is preferably the region in which the fastening element is connected to the corresponding fastening element. The force-locking region is preferably a region: in this region, the fastening element is in particular at least substantially non-positively connected with the force-fitting element. The force-locking region and the fastening region are preferably arranged one behind the other, viewed along the fastening axis. Preferably, the ratio between the length of the fixing region and the length of the force-locking region along the fixing axis is in particular at least 1.05, preferably at least 1.1, particularly preferably 1.2. Preferably, the fixing element has a thread or other type of connection means in the fixing area. Preferably, the fastening element in the fastened state rests against the force-fitting element in the force-fitting region. Preferably, the fastening element is configured without a thread or a connector piece along the fastening axis in the force-locking region. Preferably, the fixing element has an overall length along the fixing axis, which is in particular equal to the sum of the length of the force-locking region and the length of the fixing region. The fixing element preferably has an at least substantially hollow annular basic shape in the force-locking region. The fastening element preferably has an at least substantially n-sided basic shape in the fastening region, in particular a basic shape corresponding to the plug-in wrench. Preferably, the fixing element has a larger maximum diameter in a plane extending at least substantially perpendicularly to the fixing axis in the fixing region than in a plane extending parallel thereto, in particular at least substantially perpendicularly to the fixing axis, in the force-locking region. The fixing element preferably has a maximum inner diameter of the thread in a plane extending at least substantially perpendicularly to the fixing axis, which is equal to, in particular smaller than, the inner diameter of the fixing element in the force-fitting region, and/or of the connecting means. Preferably, the sum of the total length of the fixing element along the fixing axis and the thickness of the chainsaw blade is smaller than the length of the screwless or jointless member of the corresponding fixing element, which length is arranged outside the drive unit and/or the housing. The fastening unit preferably has at least one non-fastened state in such a way that, in particular, the counter-fastening element is arranged outside the fastening region of the fastening element. The force-locking element is preferably designed such that in at least one non-fixed state of the fixing unit the fixing element is at least partially loaded with a securing force. In particular, it is preferred that the fixing element, viewed along the fixing axis, rests on the force-fitting element over at least a partial length of the force-fitting region in at least one non-fixed state of the fixing unit. Preferably, the fixing element is guided along the fixing axis in the force-locking region on the counter-fixing element at least during the transition from the fixing state to the at least one non-fixing state via the hollow cylindrical basic shape, wherein in particular an inner surface of the hollow cylindrical basic shape at least partially bears against an outer surface of the counter-fixing element. By configuring the fastening device according to the invention, it is advantageously ensured that the fastening element is secured against detachment on the cover unit, in particular on the cover element, during and after detachment of the fastening unit. Tilting of the cover unit, in particular of the cover element and/or of the fixing unit, when at least one of the plurality of fixing elements of the fixing unit is released can advantageously be at least substantially avoided.

Furthermore, it is proposed that the securing unit has at least one force-locking element, in particular the aforementioned force-locking element, which is at least partially designed as a magnet, for a force-locking, in particular magnetic, connection, in particular at least substantially form-locking-free, with at least one fixing element of the fixing unit, in particular the aforementioned fixing element. Preferably, the force-locking element is made of a neodymium-containing and/or iron-containing material and/or other magnetic materials known to the person skilled in the art. Preferably, a force-locking element, which is at least partially designed as a magnet, is provided for securing the securing element on the cover unit, in particular on the cover element, against release by magnetic force. The force-fitting element is preferably arranged around a fixed axis. The force-fitting element and the fastening element are preferably arranged coaxially at least partially around the fastening axis in at least one fastening state. In at least one fixing state of the fixing unit, the fixing element preferably rests at least partially against the force-closure element in at least one plane extending at least substantially perpendicularly to the fixing axis. However, it is also conceivable for the force-fitting element, viewed along the fastening axis, to be arranged at a distance from the fastening element and to be provided for securing the fastening element on the cover unit, in particular on the cover element, by means of magnetic force. Alternatively or additionally, it is conceivable for the fastening element to be at least partially designed as a magnet, wherein in particular the force-locking element is at least partially designed as a magnet or is made of a ferromagnetic material. By configuring the fastening device according to the invention, an advantageously firm and durable securing of the fastening unit can be achieved, in particular because wear and expenditure of the force-fitting elements and fastening elements can be advantageously avoided. A reliable connection between the securing unit and the fixing unit can advantageously be achieved.

It is further proposed that the securing unit has at least one force-fitting element, in particular the aforementioned force-fitting element, for a force-fitting connection, in particular a magnetic connection, with at least one fixing element of the fixing unit, in particular the aforementioned fixing element, in particular at least substantially without form-fit, wherein the force-fitting element is at least partially formed from plastic and/or rubber at least in the force-fitting region of the force-fitting element. Preferably, the force-fitting element rests on the fastening element in the force-fitting region of the force-fitting element, in particular on a surface which is oriented at least partially at least substantially parallel to the fastening axis. Preferably, the force-locking element is provided for securing the securing element against detachment from the cover unit, in particular from the cover element, by means of friction. Preferably, the force-locking element is provided for: the force-locking element is applied to the fastening element in a direction oriented at least substantially parallel to the fastening axis by the force-locking element abutting against the fastening element in the force-locking region of the force-locking element. It is conceivable for the fixing element in the force-locking region of the fixing element to be designed in such a way that the frictional force in a direction oriented at least substantially parallel to the fixing axis is greater than the frictional force acting on the fixing element by rotation of the fixing element relative to the force-locking element about the fixing axis. It is conceivable for the force-fitting element to be arranged on the cover unit, in particular on the cover element, so as to be rotatable about a fixed axis. By configuring the fastening device according to the invention, a low production cost of the force-fitting element can be advantageously achieved. An advantageous lightweight safety unit can be realized. A favourable high resistance to environmental influences and/or contamination can be achieved.

It is furthermore proposed that the securing unit has at least one force-locking element, in particular the aforementioned force-locking element, for a force-locking, in particular magnetic, connection, in particular at least substantially non-form-locking, with at least one fixing element of the fixing unit, in particular the aforementioned fixing element, wherein the force-locking element is at least substantially conically or at least partially annularly configured on the side facing the fixing element, in particular in the force-locking region of the force-locking element. Preferably, the force-fitting element, in particular the at least substantially conical force-fitting element, has at least one basic shape on the side facing away from the fastening element, which at least partially tapers in the direction facing the drive unit and/or the housing. The force-locking element is configured, for example, as an O-ring, wedge ring or the like. Preferably, the force-fitting element has a minimum inner diameter which is at least substantially equal to the maximum outer diameter of the fastening element in the force-fitting region. By configuring the fastening device according to the invention, in particular along an axis oriented at least substantially parallel to the fastening axis, an advantageously compact force-locking surface can be achieved, with which in particular the force of the securing unit against loosening of the fastening unit can be advantageously reduced and/or the transition point of the fastening unit, in particular of the fastening element, from the secured state to the unsecured state can be advantageously precisely adjusted.

Furthermore, it is proposed that the securing unit has at least one force-locking element, in particular a further force-locking element, which is provided for fastening or holding the chainsaw blade to the drive unit and/or the housing independently of the cover unit, in particular the cover element, in at least one direction, in particular in the non-secured state of the securing unit, in particular by a force-locking connection, in particular a magnetic connection, with at least one securing element of the securing unit, which is arranged on the drive unit and/or the housing, in at least one non-secured state of the securing unit. Preferably, the further force-fitting element is provided for securing the chainsaw blade against movement on the drive unit and/or the housing along a fixed axis and/or at least substantially perpendicularly to the fixed axis, in particular by a force-fitting connection with the further fixing element. Preferably, the further force-locking element can be connected in a force-locking and/or form-locking manner to a force-locking element, which is arranged in particular on the cover unit, in particular for fixing and/or retaining the cover unit on the drive unit and/or the housing. Preferably, the further force-fitting element is at least partially made of a magnetizable material and/or is designed as a magnet. In particular, the further fixing element is at least partially made of a magnetizable material and/or is designed as a magnet. Preferably, the further force-locking element is provided in the state of being arranged on the aforementioned force-locking element for securing the securing element against removal from the cover unit, in particular the cover element, by means of a force-locking, in particular form-locking, connection in the secured state of the securing unit. Preferably, the further force-locking element is arranged spaced apart from the cover element and/or the force-locking element in a state in which the cover unit is spaced apart from the chainsaw blade. In a particularly preferred embodiment, the further force-locking element is formed integrally with the chainsaw blade. Preferably, the further fixing element is formed integrally with the drive unit and/or the housing. Preferably, the further fixing element is arranged separately from the corresponding fixing element. Preferably, the further force-closure element and/or the further fixing element is/are designed such that the force-closure holding force, in particular the magnetic force, between the further force-closure element and the further fixing element is at least substantially greater than the total weight force of the chainsaw blade, the cutting chain and/or the further force-closure element. By configuring the fastening device according to the invention, an advantageously high functionality of the safety unit can be achieved. An advantageous simple and fast assembly of the chainsaw blade can be achieved. Unintentional loosening of the chainsaw blade from the drive unit and/or the housing can advantageously be avoided. In particular, an advantageously high safety can be achieved when changing the cutting chain and/or the chainsaw blade.

Furthermore, a chainsaw is proposed, which comprises at least one chainsaw blade, at least one drive unit and/or a housing and at least one fastening device according to the invention for fastening the chainsaw blade to the drive unit and/or the housing. The chainsaw preferably comprises at least one cutting chain which can be driven around the chainsaw blade by means of a drive unit via the chainsaw blade. By configuring the chainsaw according to the invention, it is advantageously possible to fasten the chainsaw blade to the drive unit and/or the housing in a simple and reliable manner, in particular because the fastening unit can be secured against detachment from the fastening unit at least in part without form-locking, and thus operating errors or malfunctions due to damage can be avoided. Low costs may advantageously be made possible. Wear of the components can advantageously be at least substantially avoided, in particular because securing can be carried out without form closure.

The fastening device according to the invention and/or the chainsaw according to the invention should not be limited to the above-described applications and embodiments. In particular, the fastening device according to the invention and/or the chain saw according to the invention can have a different number of individual elements, components and units than those mentioned here in order to achieve the functions described here. Furthermore, for the value ranges specified in the present disclosure, values within the mentioned boundaries should also be considered disclosed and may be used arbitrarily.

Drawings

Other advantages will appear from the following description of the drawings. Three embodiments of the invention are shown in the drawings. The figures, description and claims contain a number of combinations of features. Those skilled in the art can also individually consider these features and combine them into meaningful other combinations more appropriately.

The figures show:

fig. 1 is a schematic exploded view of a chainsaw according to the invention with a fixing arrangement according to the invention for fixing a chainsaw blade of a chainsaw according to the invention to a drive unit and/or a housing of a chainsaw according to the invention,

fig. 2 is a schematic sectional view of a part of a chainsaw according to the invention in the region of a fixing device according to the invention in the fixed state of the fixing unit of the fixing device,

figure 3 is a schematic exploded view in section of a part of a chainsaw according to the invention in the area of a fixing means according to the invention,

fig. 4a schematic illustration of a cross section of a cover unit and a fastening unit of an alternative configuration of a fastening device according to the invention, an

Fig. 5 is a schematic illustration of a section through a cover unit and a securing unit of a further alternative embodiment of the fastening device according to the invention.

Detailed Description

Fig. 1 shows an exploded view of a chainsaw 10 a. The chainsaw 10a includes a chainsaw blade 22a, a drive unit 14a, a housing 16a, and a securing device 12a for securing the chainsaw blade 22a to the drive unit 14a and/or the housing 16 a. The chain saw 10a includes a cutting chain for machining a workpiece, which is not shown in fig. 1. Preferably, the drive unit 14a is arranged for driving the cutting chain into a movement around the chainsaw blade 22 a. The drive unit 14a is designed here as an electric motor. However, other configurations of the drive unit 14a are also conceivable, for example in the form of an internal combustion engine. The housing 16a encloses at least a substantial portion of the drive unit 14 a. The chain saw 10a, in particular the housing 16a, comprises two handle elements 17a for handling by a user.

The fastening device 12a has a fastening unit 18a, a cover unit 20a and a securing unit 24 a. Preferably, the fixing device 12a is provided for removably fixing the chainsaw blade 22a to the drive unit 14a and/or the housing 16a of the chainsaw 10a via the fixing unit 18 a. Preferably, the fastening device 12a, in particular the fastening unit 18a, is provided for being released for exchanging and/or cleaning the chainsaw blade 22a, the cutting chain, the drive unit 14a and/or the housing 16 a. The fixing unit 18a has a fixed state in which the cover unit 20a and the chainsaw blade 22a are fixed to the drive unit 14a and/or the housing 16a via the fixing unit 18 a. The fixing unit 18a has two fixing elements 28a and two corresponding fixing elements 46 a. Two corresponding fixing elements 46a are firmly connected with the drive unit 14a and the housing 16 a. In the secured state of the securing unit 18a, each of the two securing elements 28a is connected to a respective one of the corresponding securing elements 46 a. The fastening unit 18a has, for each fastening element 28a, a fastening axis 38a, along which the fastening element 28a can be removed from the corresponding fastening element 46a in order to release the fastening unit 18a, and/or along which the fastening element 28a can be connected to the corresponding fastening element 46a in order to fasten the fastening unit 18a, in particular the cover unit 20a and/or the chainsaw blade 22a, to the drive unit 14a and/or the housing 16 a. The fixing axis 38a is oriented at least substantially perpendicularly to the main extension axis of the chainsaw blade 22a and the main extension axis of the cover unit 20 a. The fastening element 28a is configured as a nut. The counter-securing element 46a is configured as a bolt. The fixing element 28a can be screwed onto the corresponding fixing element 46a about the fixing axis 38 a. However, other configurations of the fastening unit 18a, in particular of the fastening element 28a and/or of the counter-fastening element 46a, are also conceivable, in particular with a number of fastening elements 28a and/or counter-fastening elements 46a differing from two.

The cover unit 20a is provided for at least partially covering the fastening unit 18a and/or the chainsaw blade 22a, in particular in the region of the fastening unit 18a and/or the chainsaw blade 22a that rests against the drive unit 14a and/or the housing 16a of the chainsaw 10 a. The cover unit 20a has a cover element 30a, which is at least partially configured to correspond to the housing 16a of the chainsaw 10 a. The cover element 30a is at least partially made of plastic. The cover element 30a is preferably provided for covering at least the drive unit 14a of the chainsaw 10a and/or at least one chain drive region 31a of the housing 16a, in particular at least one drive pinion. In the secured state of the securing unit 18a, the cover element 30a rests at least partially, in particular at least predominantly, against the housing 16a of the chainsaw 10 a. In the secured state of the securing unit 18a, the cover element 30a and the housing 16a at least partially, in particular at least predominantly, enclose the securing unit 18a, the safety unit 24a and/or the chainsaw blade 22 a. However, other configurations of the cover unit 20a are also contemplated.

The securing unit 24a is provided to secure the fastening unit 18a, in particular the fastening element 28a, against a release at least partially on the cover unit 20a, in particular the cover element 30 a. Preferably, the securing unit 24a is provided to secure the fastening element 28a against detachment at the cover element 30a at least in an axial direction along one of the fastening axes 38 a. Preferably, the fastening element 28a, in the secured state by means of the securing unit 24a, can be rotated relative to the securing unit 24a by more than 360 ° about the fastening axis 38 a. In the secured state of the securing unit 18a, the securing unit 24a is arranged at least partially on the cover unit 20a and the securing unit 18 a. The securing unit 24a is designed as an at least substantially form-locking-free force-locking unit, in particular, wherein the securing of the fastening unit 18a, in particular of the fastening element 28a, on the cover unit 20a, in particular on the cover element 30a, by the securing unit 24a takes place at least predominantly, in particular at least substantially completely, by force locking. The securing unit 24a has two force-fitting elements 26a, which are provided for a force-fitting connection, in particular at least substantially form-locking-free, with one of the fastening elements 28a of the fastening unit 18 a. The two force-locking elements 26a are of annular design. The two force-fitting elements 26a have the basic shape of a hollow cylinder. The two force-locking elements 26a are at least partially designed as magnets. The two fastening elements 28a and the two counter-fastening elements 46a are made of magnetizable and/or magnetic material. However, other configurations of the safety unit 24a are also conceivable.

Fig. 2 shows a sectional view of the chainsaw 10a in the area of the fastening device 12a in the fastened state of the fastening unit 18 a. The cutting plane of this section plane extends parallel to the fixed axis 38 a. The fastening element 28a bears against the cover element 30a of the cover unit 20a and/or the force-locking element 26a of the securing unit 24a in a direction oriented at least substantially perpendicularly to the fastening axis 38 a. The fastening element 28a is arranged spaced apart from the safety unit 24a, in particular from the form-locking element 26a, along a fastening axis 38 a. The two fastening elements 28a and the two counter-fastening elements 46a each have a thread 33a, wherein in particular the thread 33a of the fastening element 28a is configured to correspond to the thread 33a of the counter-fastening element 46 a. The force-locking element 26a engages in the cover unit 20a, in particular in the cover element 30a, and is fixed in the slot 32a of the cover element 30a by means of a force-locking and/or form-locking connection. It is also conceivable for the force-locking element 26a to be formed integrally with the cover element 30a by means of a material-locking connection. The force-locking element 26a is arranged, in particular in the fastened state of the fastening unit 18a, on at least one side of the cover element 30a facing away from the fastening element 28 a. The cover element 30a is arranged at least partially between the fastening element 28a and the force-fitting element 26a, in particular in the fastened state of the fastening unit 18 a. The notches 32a are configured to correspond to the basic shape of the force-locking element 26 a. In the state in which the fastening element 28a is arranged on the cover unit 20a, in particular on the cover element 30a of the cover unit 20a, the force-fitting element 26a at least partially surrounds the fastening element 28a at least substantially completely, in particular in a plane extending at least substantially perpendicularly to the fastening axis 38 a. It is conceivable that, in particular in the secured state of the securing unit 18a and/or in the secured state of the securing element 28a, the force-fitting element 26a is arranged around the securing element 28a, in particular in the circumferential direction of the securing element 28a, along at least one angular range of, in particular, more than 5 °, preferably more than 15 °, and particularly preferably more than 45 °. Preferably, the securing unit 24a, in particular the force-locking element 26a, and/or the cover unit 20a, in particular the cover element 30a, are provided for keeping the fixing element 28a spaced apart from the chainsaw blade 22a in the fixed state of the fixing unit 18 a. The fixing element 28a has a distance 52a from the chainsaw blade 22a in the fixed state.

Fig. 3 shows an exploded view of the chainsaw 10a with the fastening device 12a in a sectional view. The fastening element 28a comprises a force-locking region 34a and a fastening region 36a, wherein the length 40a of the force-locking region 34a along one of the fastening axes 38a of the fastening unit 18a is greater than the length 42a of the fastening region 36 a. The force-locking regions 34a and the fastening regions 36a are arranged one behind the other, viewed along one of the fastening axes 38 a. The fastening element 28a is designed such that the ratio between the length 42a of the fastening region 36a and the length 40a of the force-locking region 34a along one of the fastening axes 38a is in particular at least 1.05, preferably at least 1.1, particularly preferably 1.2. The thread 33a of the fastening element 28a is arranged in the fastening region 36 a. In the fastened state, the fastening element 28a rests against the force-closure element 26a in the force-closure region 34 a. The fastening element 28a is designed as a non-threaded or non-coupling part along one of the fastening axes 38a in the force-locking region 34 a. The fastening element 28a has an overall length along one of the fastening axes 38a, which is in particular equal to the sum of the length 40a of the force-locking region 34a and the length 42a of the fastening region 36 a. The fastening element 28a has an at least substantially hollow annular basic shape in the force-locking region 34 a. In the fastening region 36a, the fastening element 28a has an at least substantially n-sided basic shape, which is designed in particular to correspond to a socket wrench. The fastening element 28a has a larger maximum diameter in the fastening region 36a in a plane extending at least substantially perpendicularly to the fastening axis 38a than in the force-locking region 34a, in particular in a plane extending parallel thereto at least substantially perpendicularly to the fastening axis 38 a. The fastening element 28a has, in a plane extending at least substantially perpendicularly to the fastening axis 38a, a maximum inner diameter of the thread 33a which is equal to, in particular smaller than, the inner diameter of the fastening element 28a in the force-locking region 34 a. The sum of the total length of the fixing element 28a along one of the fixing axes 38a and the thickness 48a of the chainsaw blade 22a is less than the length 50a of the unthreaded or non-connector piece of the corresponding fixing element 46a, which is disposed outside the drive unit 14a and the housing 16 a. The force-locking element 26a is designed in such a way that the securing element 28a is at least partially loaded with a securing force in at least one non-secured state of the securing unit 18 a. In the non-fastened state of the fastening unit 18a, the fastening element 28a is arranged at least partially on one of the force-closure elements 26a over the length 42a of the force-closure region 34a, viewed along one of the fastening axes 38 a. It is conceivable for the securing unit 24a to have a further force-locking element 56a, which is shown in dashed lines in fig. 3. The further force-locking element 56a is provided for fixing and/or retaining the chainsaw blade 22a to the drive unit 14a and/or the housing 16a independently of the cover unit 20a, in particular along one of the fastening axes 38a, at least in one direction, in particular by means of a force-locking magnetic connection, in particular with at least one further fastening element 58a of the fastening unit 18a, which is arranged on the drive unit 14a and/or the housing 16a, in particular in at least one non-fastened state of the fastening unit 18 a. The further fastening element 58a is shown in particular in fig. 3. The further fastening element 58a is formed integrally with the drive unit 14a and/or the housing 16 a. The further force-locking element 56a is formed integrally with the chainsaw blade 22 a. The further force-locking element 56a is at least partially made of magnetizable material and/or is designed as a magnet. In the case of the formation of the further force-locking element 56a, the further force-locking element 56a exerts a magnetic force on a further fastening element 58a, which is made of magnetizable material and/or is formed as a magnet, as a result of which, in particular, the chainsaw blade 22a is fastened and/or held on the drive unit 14a and/or the housing 16 a. In particular, the further force-locking element 56a and the further fastening element 58a are designed such that the force of the force-locking magnetic force between the further force-locking element 56a and the further fastening element 58a is at least substantially greater than the total weight of the chainsaw blade 22a, the cutting chain and the further force-locking element 56 a.

Another embodiment of the present invention is shown in fig. 4 and 5. The following description and the figures are substantially limited to the differences between the exemplary embodiments, wherein for components having the same designation, in particular corresponding components having the same reference numerals, reference can in principle also be made to the figures and/or descriptions of further exemplary embodiments, in particular to the figures and/or descriptions of fig. 1 to 3. To distinguish the embodiments, the letter a is placed after the reference numerals of the embodiments in fig. 1 to 3. In the embodiment of fig. 4 and 5 the letter a is replaced by the letters b and c.

Fig. 4 shows a section through an alternative configuration of the safety unit 24b of the cover unit 20b and of the fastening device 12b for fastening the chainsaw blade 22b to the drive unit 14b and/or the housing 16b of the chainsaw 10b, although these are not shown in fig. 4. The fastening device 12b shown in fig. 4 has an at least substantially similar configuration to the fastening device 12a described in the description of fig. 1 to 3, so that at least substantially reference can be made to the description of fig. 1 to 3 with regard to the configuration of the fastening device 12b shown in fig. 4. In contrast to the fastening device 12a described in the description of fig. 1 to 3, the securing unit 24b of the fastening device 12b shown in fig. 4 preferably has two force-locking elements 26b for a force-locking connection, in particular at least substantially without form-locking, with at least one fastening element 28b of the fastening unit 18b of the fastening device 12 b. However they are not shown in fig. 4. The securing unit 24b is designed as an at least substantially form-locking force-locking unit. The force-locking element 26b is at least partially designed in the form of a circular ring on the side facing the fastening element 28 b. The force-locking element 26b is at least partially made of rubber and/or plastic in the force-locking region 44b of the force-locking element 26 b. The surface 54b of the force-locking element 26b arranged in the force-locking region 44b is curved. The force-locking element 26b is provided to secure the securing element 28b against detachment from the cover unit 20b, in particular the cover element 30b, by means of friction. Preferably, the force-locking element 26b is provided for loading the fastening element 28b with a frictional force in a direction at least substantially parallel to one of the fastening axes 38b by the force-locking element 26b abutting against the fastening element 28b in the force-locking region of the force-locking element 26 b.

Fig. 5 shows a section through an alternative configuration of the cover element 30c of the cover unit 20c and the securing unit 24c of the fastening device 12c for fastening the chainsaw blade 22c to the drive unit 14c and/or the housing 16c of the chainsaw 10c, which are not shown in fig. 5. The fastening device 12c shown in fig. 5 has an at least substantially similar configuration to the fastening device 12a described in the description of fig. 1 to 3, so that reference can be made at least substantially to the description of fig. 1 to 3 with regard to the configuration of the fastening device 12c shown in fig. 5. In contrast to the fastening device 12a described in the description of fig. 1 to 3, the securing unit 24c of the fastening device 12c shown in fig. 5 preferably has two force-locking elements 26c for a force-locking connection, in particular at least substantially without form-locking, with at least one fastening element 28c of the fastening unit 18c of the fastening device 12 c. However they are not shown in fig. 5. The securing unit 24c is designed as an at least substantially form-locking force-locking unit. The force-locking element 26c is at least substantially conical on the side facing the fastening element 28 c. The force-locking element 26c is at least partially made of rubber and/or plastic in the force-locking region 44c of the force-locking element 26 c. The face 54c of the force-locking element 26c arranged in the force-locking region 44c is formed flat, wherein the fastening element 28c tapers on the face 54c in a direction oriented at least substantially parallel to the fastening axis 38c and facing the chainsaw blade 22 c. The force-locking element 26c is provided to secure the securing element 28c against removal from the cover unit 20c, in particular the cover element 30c, by means of friction. Preferably, the force-closure element 26c is provided for loading the fastening element 28c with a frictional force in a direction oriented at least substantially parallel to one of the fastening axes 38c by the force-closure element 26c abutting against the fastening element 28c in the force-closure region of the force-closure element 26 c.

Claims

1. Fastening device for fastening a chainsaw blade to a drive unit and/or a housing of a chainsaw, comprising at least one cover unit (20 a; 20 b; 20c), comprising at least one fastening unit (18 a; 18 b; 18c) for fastening the chainsaw blade (22 a; 22 b; 22c) and the cover unit (20 a; 20 b; 20c) to the drive unit (14 a; 14 b; 14c) and/or the housing (16 a; 16 b; 16c), and comprising at least one securing unit (24 a; 24 b; 24c) which is provided to secure the fastening unit (18 a; 18 b; 18c) at least partially against detachment at the cover unit (20 a; 20 b; 20c), characterized in that the securing unit (24 a; 24 b; 24c) is designed as an at least substantially form-locking force-locking unit, in particular as a magnetic unit.

2. Fastening arrangement according to claim 1, characterized in that the securing unit (24 a; 24 b; 24c) has at least one force-locking element (26 a; 26 b; 26c) for a force-locking, in particular magnetic, connection, in particular at least substantially without form-locking, with at least one fastening element (28 a; 28 b; 28c) of the fastening unit (18 a; 18 b; 18c), wherein the force-locking element (26 a; 26 b; 26c) engages in the cover unit (20 a; 20 b; 20c), in particular in a cover element (30 a; 30 b; 30c) of the cover unit (20 a; 20 b; 20c) which rests on the chain saw blade (22 a; 22 b; 22c), in particular is fastened in a slot of the cover element (30 a; 30 b; 30c) by means of a force-locking and/or form-locking connection or is fastened to the cover element (30 a; 30 b; 30c) by means of a material-locking connection ) Are constructed integrally.

3. Fastening device according to claim 1 or 2, characterized in that the securing unit (24 a; 24 b; 24c) has at least one force-locking element (26 a; 26 b; 26c) for a force-locking, in particular magnetic, connection, in particular at least substantially without form-locking, with at least one fastening element (28 a; 28 b; 28c) of the fastening unit (18 a; 18 b; 18c), wherein the force-locking element (26 a; 26 b; 26c) at least partially surrounds the fastening element (28 a; 28 b; 28c) in the state in which the fastening element (28 a; 28 b; 28c) is arranged on the cover unit (20 a; 20 b; 20c), in particular on a cover element (30 a; 30 b; 30c) of the cover unit (20 a; 20 b; 20 c).

4. Fastening device according to one of the preceding claims, characterized in that the securing unit (24 a; 24 b; 24c) has at least one force-locking element (26 a; 26 b; 26c) for a force-locking, in particular magnetic, connection, in particular at least substantially without form-locking, with at least one fastening element (28 a; 28 b; 28c) of the fastening unit (18 a; 18 b; 18c), wherein the force-locking element (26 a; 26 b; 26c) is of annular configuration.

5. The fastening device according to one of the preceding claims, characterized in that the securing unit (24 a; 24 b; 24c) has at least one force-locking element (26 a; 26 b; 26c) for a force-locking, in particular magnetic, connection, in particular at least substantially without form-locking, with at least one fastening element (28 a; 28 b; 28c) of the fastening unit (18 a; 18 b; 18c), wherein the fastening element (28 a; 28 b; 28c) comprises a force-locking region (34a) and a fastening region (36a), wherein a length (40a) of the force-locking region (34a) along a fastening axis (38 a; 38 b; 38c) of the fastening unit (18 a; 18 b; 18c) is greater than a length (42a) of the fastening region (36 a).

6. Fastening device according to one of the preceding claims, characterized in that the securing unit (24a) has at least one force-locking element (26a) which is at least partially designed as a magnet and which serves for a force-locking, in particular magnetic, connection, in particular at least substantially without form-locking, with at least one fastening element (28a) of the fastening unit (18 a).

7. Fastening device according to one of the preceding claims, characterized in that the securing unit (24 b; 24c) has at least one force-locking element (26 b; 26c) for a force-locking, in particular magnetic, connection, in particular at least substantially non-form-locking, with at least one fastening element (28 b; 28c) of the fastening unit (18 b; 18c), wherein the force-locking element (26 b; 26c) is at least partially made of plastic and/or rubber at least in a force-locking region (44 b; 44c) of the force-locking element (26 b; 26 c).

8. Fastening device according to one of the preceding claims, characterized in that the securing unit (24 b; 24c) has at least one force-locking element (26 b; 26c) for a force-locking, in particular magnetic, connection, in particular at least substantially non-form-locking, with at least one fastening element (28 b; 28c) of the fastening unit (18 b; 18c), wherein the force-locking element (26 b; 26c) is at least substantially conically or at least partially annularly configured on the side facing the fastening element (28 b; 28 c).

9. A fixing device according to one of the preceding claims, characterized in that the securing unit (24 a; 24 b; 24c) has at least one force-closure element (26 a; 26 b; 26c) which is provided for, in at least one non-fixed state of the fixing unit (18 a; 18 b; 18c), the chainsaw blade (22 a; 22 b; 22c) is fixed on the drive unit (14 a; 14 b; 14c) and/or the housing (16 a; 16 b; 16c) independently of the cover unit (20 a; 20 b; 20c) in at least one direction, in particular by a force-locking connection, in particular a magnetic connection, with at least one fixing element (28 a; 28 b; 28c) of the fixing unit (18 a; 18 b; 18c) arranged on the drive unit (14 a; 14 b; 14c) and/or on the housing (16 a; 16 b; 16 c).

10. Chain saw with at least one chain saw blade (22 a; 22 b; 22c), with at least one drive unit (14 a; 14 b; 14c) and/or housing (16 a; 16 b; 16c) and with at least one fixing device (12 a; 12 b; 12c) according to one of the preceding claims for fixing a chain saw blade (22 a; 22 b; 22c) on the drive unit (14 a; 14 b; 14c) and/or the housing (16 a; 16 b; 16 c).